0xffffffff82fa0467 is in hmt_probe (/usr/src/sys/dev/hid/hmt.c:758).
753				if (hi.collevel == 1 &&
754				    hi.usage >= HID_USAGE2(HUP_BUTTON, left_btn) &&
755				    hi.usage <= HID_USAGE2(HUP_BUTTON, HMT_BTN_MAX)) {
756					btn = (hi.usage & 0xFFFF) - left_btn;
757					setbit(sc->buttons, btn);
758					sc->btn_loc[btn] = hi.loc;
759					if (btn >= sc->max_button)
760						sc->max_button = btn + 1;
761					break;
762				}
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:57
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:405
#2  0xffffffff80b42947 in kern_reboot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:526
#3  0xffffffff80b42e1f in vpanic (fmt=0xffffffff81134c30 "%s", ap=ap@entry=0xfffffe0135797710) at /usr/src/sys/kern/kern_shutdown.c:970
#4  0xffffffff80b42c73 in panic (fmt=<unavailable>) at /usr/src/sys/kern/kern_shutdown.c:894
#5  0xffffffff8100b81c in trap_fatal (frame=0xfffffe0135797800, eva=18446735329518410560) at /usr/src/sys/amd64/amd64/trap.c:952
#6  0xffffffff8100b86f in trap_pfault (frame=0xfffffe0135797800, usermode=false, signo=<optimized out>, ucode=<optimized out>) at /usr/src/sys/amd64/amd64/trap.c:760
#7  <signal handler called>
#8  0xffffffff82fa0467 in hmt_hid_parse (sc=0xfffff8001597d000, d_ptr=0xfffff8001025f400, d_len=752, tlc_usage=<optimized out>, tlc_index=<optimized out>) at /usr/src/sys/dev/hid/hmt.c:758
#9  hmt_probe (dev=0xfffff80010279900) at /usr/src/sys/dev/hid/hmt.c:283
#10 0xffffffff80b7dfcf in DEVICE_PROBE (dev=0xfffff80010279900) at ./device_if.h:115
#11 device_probe_child (dev=<optimized out>, child=child@entry=0xfffff80010279900) at /usr/src/sys/kern/subr_bus.c:1662
#12 0xffffffff80b7f0cb in device_probe (dev=dev@entry=0xfffff80010279900) at /usr/src/sys/kern/subr_bus.c:2463
#13 0xffffffff80b813b7 in device_probe_and_attach (dev=0xfffff80010279900) at /usr/src/sys/kern/subr_bus.c:2485
#14 bus_generic_driver_added (dev=<optimized out>, driver=<optimized out>) at /usr/src/sys/kern/subr_bus.c:3706
#15 0xffffffff80b7cdd9 in BUS_DRIVER_ADDED (_dev=0xfffff80010279e00, _driver=0xffffffff82fa6230 <hconf_driver>) at ./bus_if.h:210
#16 devclass_driver_added (dc=dc@entry=0xfffff8001016aa80, driver=0xffffffff82fa6230 <hconf_driver>) at /usr/src/sys/kern/subr_bus.c:603
#17 0xffffffff80b84dcb in device_do_deferred_actions () at /usr/src/sys/kern/subr_bus.c:5312
#18 0xffffffff80b849e7 in devctl2_ioctl (cdev=<optimized out>, cmd=2157462540, data=0xfffff80013379700 "", fflag=<optimized out>, td=0xfffffe01358a5ac0) at /usr/src/sys/kern/subr_bus.c:5595
#19 0xffffffff809d0b7c in devfs_ioctl (ap=0xfffffe0135797c40) at /usr/src/sys/fs/devfs/devfs_vnops.c:933
#20 0xffffffff80c3b264 in vn_ioctl (fp=0xfffff80015659e60, com=18446741879878416712, data=0xfffff80013379700, active_cred=0xfffff800102cee00, td=0x3) at /usr/src/sys/kern/vfs_vnops.c:1701
#21 0xffffffff809d121e in devfs_ioctl_f (fp=0x54, com=18446741879878416712, data=0x3, cred=0x2fffffffd, td=0x3) at /usr/src/sys/fs/devfs/devfs_vnops.c:864
#22 0xffffffff80bb11b5 in fo_ioctl (fp=0xfffff80015659e60, com=2157462540, data=0x3, active_cred=0x2fffffffd, td=0xfffffe01358a5ac0) at /usr/src/sys/sys/file.h:366
#23 kern_ioctl (td=td@entry=0xfffffe01358a5ac0, fd=<optimized out>, com=com@entry=2157462540, data=0x3 <error: Cannot access memory at address 0x3>, data@entry=0xfffff80013379700 "") at /usr/src/sys/kern/sys_generic.c:805
#24 0xffffffff80bb0ef3 in sys_ioctl (td=0xfffffe01358a5ac0, uap=0xfffffe01358a5ec0) at /usr/src/sys/kern/sys_generic.c:713
#25 0xffffffff8100c0d9 in syscallenter (td=0xfffffe01358a5ac0) at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:187
#26 amd64_syscall (td=0xfffffe01358a5ac0, traced=0) at /usr/src/sys/amd64/amd64/trap.c:1197
#27 <signal handler called>
#28 0x0000228489399eaa in ?? ()
Backtrace stopped: Cannot access memory at address 0x228488818b08